Genetics HW

Which of the following best describes the shape of a DNA molecule?

• double helix

• single helix

• linear helix

• circular helix

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• adenine

• thymine

• cytosine

• guanine

Guanine always bonds with ______

• adenine

• thymine

• guanine

• cytosine

What would the complimentary bases be for the following strand of DNA:

ATTCGA

• TAAGGG

• GATCGA

• TAAGCT

• GCCATG

Name three types of mutations?

• mutation, deletion, addition

• deletion, substitution, insertion

• insertion, deletion, addition

• substitution deletion, mutation

Normal: GAG-CTC-GAC-AGA

Mutant: GAG-GAG-CTC-GAC-AGA

• no mutation

• insertion

• duplication

• deletion

Brown eyes are dominant to blue eyes. There are two parents that are homozygous dominant and homozygous recessive. What is the percent chance they will have a child with blue eyes?

• 0%

• 25%

• 50%

• 75%

Brown eyes are dominant to blue eyes. There are two parents that are homozygous dominant and homozygous recessive. What is the percent chance they will have a child with brown eyes?

• 0%

• 75%

• 50%

• 100%

Brown eyes are dominant to blue eyes. There are two parents that are homozygous dominant and homozygous recessive. Could their grandchildren have blue eyes?

• No, its impossible

• Yes, since their children will be a carrier, their grandchildren could have blue eyes.

• No, it is possible but it is too small of a probability.

• Yes, all of their grandchildren will have blue eyes.

A punnett square has homozygous dominant and heterozygous offspring possibilities. What could be the genotypes of the parents?

• AA, Aa

• AA, aa

• AA, AA

• aa, aa